change StreamDelegate to new style (#1252)

change StreamDelegate protocol signature to match https://developer.apple.com/documentation/foundation/streamdelegate/1410079-stream
diff --git a/Foundation/Stream.swift b/Foundation/Stream.swift
index d34949d..410be23 100644
--- a/Foundation/Stream.swift
+++ b/Foundation/Stream.swift
@@ -241,11 +241,11 @@
 #endif
 
 extension StreamDelegate {
-    func stream(_ aStream: Stream, handleEvent eventCode: Stream.Event) { }
+    func stream(_ aStream: Stream, handle eventCode: Stream.Event) { }
 }
 
 public protocol StreamDelegate : class {
-    func stream(_ aStream: Stream, handleEvent eventCode: Stream.Event)
+    func stream(_ aStream: Stream, handle eventCode: Stream.Event)
 }
 
 // MARK: -